According to a new market report published by Credence Research Inc “Underground Mining Equipment Market – Growth, Share, Opportunities, Competitive Analysis, and Forecast 2016 – 2023,” the global underground mining equipment market are predicted to witness considerable growth rising demand for metals and minerals and improving economic conditions.
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Sub-surface mining consists of digging tunnels or shafts into the earth to reach buried ore deposits. Ore, for processing, and waste rock, for disposal, are brought to the surface through the tunnels and shafts. Sub-surface mining can be classified by the type of access shafts used, the extraction method or the technique used to reach the mineral deposit. Drift mining utilizes horizontal access tunnels, slope mining uses diagonally sloping access shafts, and shaft mining utilize vertical access shafts. Mining in hard and soft rock formations require different techniques.
Other methods include shrinkage stope mining, which is mining upward, creating a sloping underground room, longwall mining, which is grinding along ore surface underground, and room and pillar mining, which is removing ore from rooms while leaving pillars in place to support the roof of the room. Room and pillar mining often leads to retreat mining, in which supporting pillars are removed as miners retreat, allowing the room to cave in, thereby loosening more ore. Additional sub-surface mining methods include hard rock mining, which is mining of hard rock (igneous, metamorphic or sedimentary) materials, borehole mining, drift and fill mining, long hole slope mining, sublevel caving, and block caving. (Wikipedia)
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